diff --git a/src/api.jl b/src/api.jl
index cb233d2..cf02469 100644
--- a/src/api.jl
+++ b/src/api.jl
@@ -151,14 +151,13 @@ struct AZUREServiceEndpoint <: ServiceEndpoint end
     chat = Chat()
 
 Creates a new `Chat` object with default settings:
-- `model` is set to `gpt-4o-2024-08-06`
+- `model` is set to `gpt-4o`
 - `messages` is set to an empty `Vector{Message}`
 - `history` is set to `true`
 """
 @kwdef struct Chat
     service::Type{<:ServiceEndpoint} = OPENAIServiceEndpoint #AZUREServiceEndpoint #OPENAIServiceEndpoint
     model::String = "gpt-4o"
-    api_version::String = "2024-08-01-preview" # for Azure only
     messages::Conversation = Message[]
     history::Bool = true
     tools::Union{Vector{GPTTool},Nothing} = nothing
@@ -179,7 +178,6 @@ Creates a new `Chat` object with default settings:
     function Chat(
         service,
         model,
-        api_version,
         messages,
         history,
         tools,
@@ -202,7 +200,6 @@ Creates a new `Chat` object with default settings:
         return new(
             service,
             model,
-            api_version,
             messages,
             history,
             tools,
@@ -226,7 +223,7 @@ end
 
 StructTypes.StructType(::Type{Chat}) = StructTypes.Struct()
 StructTypes.omitempties(::Type{Chat}) = true
-StructTypes.excludes(::Type{Chat}) = (:history, :service, :api_version)
+StructTypes.excludes(::Type{Chat}) = (:history, :service)
 
 Base.length(chat::Chat) = length(chat.messages)
 Base.isempty(chat::Chat) = isempty(chat.messages)
diff --git a/src/constants.jl b/src/constants.jl
index e69d292..a4fd6d7 100644
--- a/src/constants.jl
+++ b/src/constants.jl
@@ -1,11 +1,11 @@
 const OPENAI_BASE_URL::String = "https://api.openai.com"
 const OPENAI_API_KEY::String = "OPENAI_API_KEY"
 const AZURE_OPENAI_BASE_URL::String = "AZURE_OPENAI_BASE_URL"
-const AZURE_OPENAI_DEPLOY_NAME::String = "AZURE_OPENAI_DEPLOY_NAME"
 const AZURE_OPENAI_API_KEY::String = "AZURE_OPENAI_API_KEY"
+const AZURE_OPENAI_API_VERSION::String = "AZURE_OPENAI_API_VERSION"
 
 """
-    Convenience mapping of model names to their respective endpoints.
+    Convenience mapping of OpenAI model names to their respective endpoints.
     
 """
 const _MODEL_ENDPOINTS_OPENAI::Dict{String,String} = Dict(
@@ -39,4 +39,13 @@ const _MODEL_ENDPOINTS_OPENAI::Dict{String,String} = Dict(
     "text-search-ada-doc-001" => "/v1/embeddings",
     "text-moderation-stable" => "/v1/moderations",
     "text-moderation-latest" => "/v1/moderations"
+)
+
+"""
+    Convenience mapping of OpenAI model names to their respective endpoints.
+    
+"""
+const _MODEL_ENDPOINTS_AZURE_OPENAI::Dict{String,String} = Dict(
+    "gpt-4o" => "/openai/deployments/" * ENV["AZURE_OPENAI_DEPLOY_NAME_GPT_4O"],
+    "gpt-4o-mini" => "/openai/deployments/" * ENV["AZURE_OPENAI_DEPLOY_NAME_GPT_4O_MINI"]
 )
\ No newline at end of file
diff --git a/src/requests.jl b/src/requests.jl
index 2a73f9b..8be65a3 100644
--- a/src/requests.jl
+++ b/src/requests.jl
@@ -1,16 +1,13 @@
-get_url(model::String) = OPENAI_BASE_URL * _MODEL_ENDPOINTS_OPENAI[model]
-get_url(params::Chat) = params.service == OPENAIServiceEndpoint ? get_url(params.model) : get_url(AZUREServiceEndpoint, params)
+get_url(params::Chat) = get_url(params.service, params.model)
 get_url(emb::Embeddings) = get_url(emb.model)
-get_url(::Type{OPENAIServiceEndpoint}, params::Chat) = get_url(params)
+get_url(::Type{OPENAIServiceEndpoint}, model::String) = OPENAI_BASE_URL * _MODEL_ENDPOINTS_OPENAI[model]
 get_url(::Type{OPENAIServiceEndpoint}, emb::Embeddings) = get_url(emb)
-get_url(::Type{OPENAIServiceEndpoint}, model::String) = get_url(model)
-function get_url(::Type{AZUREServiceEndpoint}, params::Chat)
-    ENV[AZURE_OPENAI_BASE_URL] * "/openai/deployments/" * ENV[AZURE_OPENAI_DEPLOY_NAME] * "/chat/completions?api-version=$(getfield(params, :api_version))"
-end
+get_url(::Type{AZUREServiceEndpoint}, model::String) = ENV[AZURE_OPENAI_BASE_URL] * "/openai/deployments/" * _MODEL_ENDPOINTS_AZURE_OPENAI[model] * "/chat/completions?api-version=$(ENV[AZURE_OPENAI_API_VERSION])"
+
 
 function auth_header(::Type{OPENAIServiceEndpoint})
     [
-        "Authorization" => "Bearer $(ENV["OPENAI_API_KEY"])",
+        "Authorization" => "Bearer $(ENV[OPENAI_API_KEY])",
         "Content-Type" => "application/json"
     ]
 end